113749981 has 4 divisors (see below), whose sum is σ = 114756732. Its totient is φ = 112743232.

The previous prime is 113749957. The next prime is 113749997. The reversal of 113749981 is 189947311.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23328900 + 90421081 = 4830^2 + 9509^2 .

It is a cyclic number.

It is not a de Polignac number, because 113749981 - 2²¹ = 111652829 is a prime.

It is a super-2 number, since 2×113749981² = 25878116355000722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113749681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 503206 + ... + 503431.

It is an arithmetic number, because the mean of its divisors is an integer number (28689183).

Almost surely, 2^113749981 is an apocalyptic number.

It is an amenable number.

113749981 is a deficient number, since it is larger than the sum of its proper divisors (1006751).

113749981 is a wasteful number, since it uses less digits than its factorization.

113749981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006750.

The product of its digits is 54432, while the sum is 43.

The square root of 113749981 is about 10665.3636131170. The cubic root of 113749981 is about 484.5260271944.

The spelling of 113749981 in words is "one hundred thirteen million, seven hundred forty-nine thousand, nine hundred eighty-one".